Fix slashes in TinyBoy printer names

Somehow they turned into underscores, but clearly they are demarking different alternatives.

Contributes to issue CURA-7515.

resources/definitions/tinyboy_e10.def.json

@@ -1,6 +1,6 @@
 {
     "version": 2,
-    "name": "TinyBoy E10_J10_L10_M10",
+    "name": "TinyBoy E10/J10/L10/M10",
     "inherits": "fdmprinter",
     "metadata": { 
         "visible": true,

resources/definitions/tinyboy_e16.def.json

@@ -1,6 +1,6 @@
 {
     "version": 2,
-    "name": "TinyBoy E16_L16_M16",
+    "name": "TinyBoy E16/L16/M16",
     "inherits": "fdmprinter",
     "metadata": { 
         "visible": true,